81427424 has 24 divisors (see below), whose sum is σ = 172642680. Its totient is φ = 37581696.

The previous prime is 81427403. The next prime is 81427427. The reversal of 81427424 is 42472418.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81427427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97454 + ... + 98285.

It is an arithmetic number, because the mean of its divisors is an integer number (7193445).

Almost surely, 2^81427424 is an apocalyptic number.

It is an amenable number.

81427424 is an abundant number, since it is smaller than the sum of its proper divisors (91215256).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81427424 is a wasteful number, since it uses less digits than its factorization.

81427424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195762 (or 195754 counting only the distinct ones).

The product of its digits is 14336, while the sum is 32.

The square root of 81427424 is about 9023.7145344919. The cubic root of 81427424 is about 433.4345883042.

The spelling of 81427424 in words is "eighty-one million, four hundred twenty-seven thousand, four hundred twenty-four".